Orbital plot showing the precession of the HS (left) and PO (right) observatory trajectories around the Earth (⨁ for HS and blue dot for PO), with regions of interest highlighted in blue (magnetosphere), red (solar wind), and green (foreshock) for HS. The thick lines in the HS plot indicate hours with ideal 3D multiscale coverage. The specific configuration we analyzed is marked with a black (red) dot for HS (PO). At this scale, it is not possible to distinguish individual spacecraft trajectories.